What are pseudo order reaction ? Give example.

Explanation

### Step-by-Step Solution:

1. **Definition of Pseudo Order Reactions**:
- Pseudo order reactions are reactions that are typically of higher order (bimolecular) but appear to be of lower order (usually first order) due to the presence of one reactant in excess. This excess reactant's concentration remains relatively constant throughout the reaction.

2. **Understanding Bimolecular Reactions**:
- A bimolecular reaction involves two reactants. The rate of the reaction is generally dependent on the concentrations of both reactants. However, if one reactant is in large excess, its concentration does not change significantly during the reaction.

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